M.J. Hibbard
Anhydrite


Anhydrite   CaSO4    Orthorhombic
o Hydrothermal (alteration) environment (chapters 12 and 18).
- Anhydrite crystals (up to 2nd order yellow interference colors) in twinned plagioclase (black/light gray strips). Reactive replacement involves liberation of Ca from the plagioclase that reacts with incoming sulfate-bearing aqueous solutions. Thin section view (1 mm wide) with XP. Specimen provided by the Smithsonian Institute (Comstock Mining District, sample no. 72317).

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